diff --git a/CHANGES.md b/CHANGES.md
index b7c99c8..b061e07 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,12 @@
 Unreleased
 --------------
 
+- httpaf-lwt-unix: replace the `dune` file (previously written in OCaml) with a
+  `(select)` form to avoid depending on `ocamlfind`
+  ([#18](https://github.com/anmonteiro/httpaf/pull/18))
+- httpaf-mirage: depend on `mirage-conduit` instead of `conduit-mirage`,
+  effectively placing a lower bound of OCaml 4.07 on httpaf-mirage
+  ([#16](https://github.com/anmonteiro/httpaf/pull/16))
 - httpaf-lwt, httpaf-lwt-unix, httpaf-mirage: deduplicate interface code via a
   common `Httpaf_lwt_intf` interface
   ([#13](https://github.com/anmonteiro/httpaf/pull/13))
diff --git a/httpaf-lwt.opam b/httpaf-lwt.opam
index 62b7130..f821753 100644
--- a/httpaf-lwt.opam
+++ b/httpaf-lwt.opam
@@ -15,7 +15,7 @@ build: [
 depends: [
   "ocaml" {>= "4.03.0"}
   "httpaf"
-  "dune" {build}
+  "dune"
   "lwt"
 ]
 synopsis: "Lwt support for http/af"
diff --git a/httpaf-mirage.opam b/httpaf-mirage.opam
index 57f5ba3..58c5c44 100644
--- a/httpaf-mirage.opam
+++ b/httpaf-mirage.opam
@@ -17,7 +17,7 @@ depends: [
   "httpaf-lwt"
   "mirage-conduit"
   "cstruct"
-  "dune" {build}
+  "dune"
   "lwt"
 ]
 pin-depends: [
diff --git a/lwt-unix/dune b/lwt-unix/dune
index d25cae5..e4856b2 100644
--- a/lwt-unix/dune
+++ b/lwt-unix/dune
@@ -1,37 +1,21 @@
-(* -*- tuareg -*- *)
-(* This was inspired by `conduit-lwt-unix`'s dune file *)
-
-let v ~ssl ~tls () =
-  let ssl, ssl_d =
-    if ssl then "ssl_io_real", "lwt_ssl "
-    else "ssl_io_dummy", ""
-  in
-  let tls, tls_d =
-    if tls then "tls_io_real", "tls.lwt "
-    else "tls_io_dummy", ""
-  in
-  Printf.sprintf {|
-(rule (copy %s.ml ssl_io.ml))
-(rule (copy %s.ml tls_io.ml))
-
 (library
  (name httpaf_lwt_unix)
  (public_name httpaf-lwt-unix)
- (libraries faraday-lwt-unix httpaf httpaf-lwt lwt.unix %s%s)
+ (libraries
+  faraday-lwt-unix
+  httpaf
+  httpaf-lwt
+  lwt.unix
+  (select
+   ssl_io.ml
+   from
+   (lwt_ssl -> ssl_io_real.ml)
+   (-> ssl_io_dummy.ml))
+  (select
+   tls_io.ml
+   from
+   (tls.lwt -> tls_io_real.ml)
+   (-> tls_io_dummy.ml)))
  (modules httpaf_lwt_unix tls_io ssl_io)
  (flags
   (:standard -safe-string)))
-|} ssl tls ssl_d tls_d
-
-let main () =
-  let is_installed s = Printf.kprintf Sys.command "ocamlfind query %s" s = 0 in
-  let ssl = is_installed "lwt_ssl" in
-  let tls = is_installed "tls.lwt" in
-  Printf.printf
-    "Configuration\n\
-    \  ssl    : %b\n\
-    \  tls    : %b\n%!"
-    ssl tls;
-  v ~ssl ~tls ()
-
-let () = Jbuild_plugin.V1.send @@ main ()